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Reduced Safety/Reliability: Arc Flash Hazard Example

Reduced Safety/Reliability: Arc Flash Hazard Example. Scenario 1: 200A RK-1 Branch Fuse 400A RK-1 Main Fuse Short circuit protection with low let-through energy Partial selective coordination, through overload range Scenario 2: Changed to 400A RK-5 Main Fuse

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Reduced Safety/Reliability: Arc Flash Hazard Example

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  1. Reduced Safety/Reliability: Arc Flash Hazard Example Scenario 1: 200A RK-1 Branch Fuse 400A RK-1 Main Fuse • Short circuit protection with low let-through energy • Partial selective coordination, through overload range Scenario 2: Changed to 400A RK-5 Main Fuse • Short circuit protection, but higher let-through energy • Total selective coordination through all current ranges

  2. Reduced Safety/Reliability: Arc Flash Hazard Example (cont’d) Description AvailableFault Current 8200A 8200A 8200A IEEE 1584 CalculatedIncident Energy, Cal/cm2 0.7 8.4 0.4 Category PPERequired 0 3 0 Scenario 1 Scenario 2  NEC Mandated Scenario 3 (For comparison purposes) PARTIAL Selective Coordination 400 Ampere Molded Case Main Circuit Breaker PARTIAL Selective Coordination 400 Ampere Class RK 1 Main Fuse TOTAL Selective Coordination 400 Ampere Class RK 5 Main Fuse

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